Crossingover is the exchange of genetic information between (homologous chromosomes that occurs during meiosis).

1. sex chromosomes

2. sister chromatids

3. chromatids

4. homologues.

Did the chicken or the egg come first.

The Universe is a single system that consists of everything that physically exists. The basic principles of the Universe, such as the conservation of mass, the conservation of energy, and the laws of gravity

While dna in a human cell was being replicated, a single base was miscopied. what will most likely be the result for the cell in which it happened?

The diagnostic term that means deficient supply of blood to the brain for a short time is called a (n) :

What is made on a ribosome

Which group of islands is called the "land of fire" and is located at the southern tip of South America? A. the Galápagos Islands B. Tierra del Fuego C. the Lesser Antilles D. the Falkland Islands

Who is responsible of enforcing an environmental law after a legislature passes it? a. the legislature b. president or prime minister c. a regulatory agency d. citizens

An area in a forest was cleared to build a road. Which two of the following will be likely effects on the ecosystem? The number of trees will increase in the forest. The new species will evolve to survive in the deforested land.

Which theory do scientists use to explain the foundation of our world's landforms?

A truck whose bed is 2.5 m long 1.5 m wide and 1.0 m high is delivering sand for sand sculpture competition. About how many trips must the truck make to deliver 7m of sand